The Prolyl Isomerase, FKBP25, Interacts with RNA-engaged Nucleolin and the Pre-60S Ribosomal Subunit

Overview

Journal RNA

Specialty Molecular Biology

Date 2014 May 21

PMID 24840943

Citations 20

Authors

Geoff Gudavicius

David Dilworth

Jason J Serpa

Nicole Sessler

Evgeniy V Petrotchenko

Christoph H Borchers

Christopher J Nelson

Affiliations

Soon will be listed here.

Abstract

Peptidyl-proline isomerases of the FK506-binding protein (FKBP) family belong to a class of enzymes that catalyze the cis-trans isomerization of prolyl-peptide bonds in proteins. A handful of FKBPs are found in the nucleus, implying that the isomerization of proline in nuclear proteins is enzymatically controlled. FKBP25 is a nuclear protein that has been shown to associate with chromatin modifiers and transcription factors. In this study, we performed the first proteomic characterization of FKBP25 and found that it interacts with numerous ribosomal proteins, ribosomal processing factors, and a small selection of chromatin modifiers. In agreement with previous reports, we found that nucleolin is a major FKBP25-interacting protein and demonstrated that this interaction is dependent on rRNA. FKBP25 interacts with the immature large ribosomal subunit in nuclear extract but does not associate with mature ribosomes, implicating this FKBP's action in ribosome biogenesis. Despite engaging nascent 60S ribosomes, FKBP25 does not affect steady-state levels of rRNAs or its pre-rRNA intermediates. We conclude that FKBP25 is likely recruited to preribosomes to chaperone one of the protein components of the ribosome large subunit.

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